Boston, Massachusetts -- Just hours after a Massachusetts Institute of Technology police officer was shot and killed at the campus, a media source reported that a suspect in the Boston Marathon bombing was taken into custody. The source reported on its website that a second suspect remained on the loose after a firefight with police in Watertown, Mass., a city next to Cambridge, Mass., across the river from Boston.

Police established a 20-block perimeter as they searched for that suspect. According to one police radio transmission, that suspect may have been the one wearing the white cap in photos released earlier in the day by FBI agents investigating Monday's bombing, which killed three people and wounded more than 150. The chaos began after a MIT police officer who was responding to a report of a disturbance Thursday night was shot multiple times. The officer, who was not immediately identified, was pronounced dead at a hospital.

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